https://www.selleckchem.com/products/Sunitinib-Malate-(Sutent).html Three probes for fluoride ion and trace water based on naphthalimide were designed and synthesized. A new sensing mechanism based on naphthalimide tautomerization induced by fluoride ion and water was explored in the aprotic organic solvent. In the fluoride ion sensing process, the probes exhibited a remarkable absorption peak centred at 560 nm in the visible range of 400-700 nm. When trace water presented, the newly formed absorption peak centred at 560 nm gradually disappeared. The sensitive colour variation of the probe also was used in fingerprint imaging. Accordingly, the significant changes in chemical shift of dept135 and 1HNMR spectrum confirmed the structural transformation of the probes with high contrast. Furthermore, this work also presented an optimization strategy for the sensitivity of the probe based on regulatory tautomerization.Among skin cancers, melanoma is the lethal form and the leading cause of death in humans. Melanoma begins in melanocytes and is curable at early stages. Thus, early detection and evaluation of its metastatic potential are crucial for effective clinical intervention. Fourier transform infrared (FTIR) spectroscopy has gained considerable attention due to its versatility in detecting biochemical and biological features present in the samples. Changes in these features are used to differentiate between samples at different stages of the disease. Previously, FTIR spectroscopy has been mostly used to distinguish between healthy and diseased conditions. With this study, we aim to discriminate between different melanoma cell lines based on their FTIR spectra. Formalin-fixed paraffin embedded samples from three melanoma cell lines (IPC-298, SK-MEL-30 and COLO-800) were used. Statistically significant differences were observed in the prominent spectral bands of three cell lines along with shifts in peak positions. A partial least square discriminant analysis (PLS-DA)